Well if that's your goal, I'd wager you're much better off actually focusing strictly on cardio work. The added work capacity means longer sessions which means more calories burned (if that's your goal) - trying to up your calorie burn by adding muscle is slow going to say the least and the difference will be minimal. Do you know anything about Leangains? I'm considering switching to that diet. Plz to inform. Serious? Bulk/cut/recomp, what?